最近一项研究表明，蜜蜂可以进行加减法的运算。
Recently, a study showed that bees could perform arithmetic operations like addition and subtraction.
蜜蜂会做加减法——它们用颜色来代替加号和减号。
Bees are capable of addition and subtraction — using colors in the place of plus and minus symbols.
不久前，研究人员发现4天大的婴儿能够理解加减法。
Not long ago, researches learned that four-day olds could understand addition and subtraction.
这小女孩已在学做加减法了。
入学第一年，多数孩子学习加减法。
In their first year at school, most children learn to ADD and subtract.
你也应该学会加减法的心算。
托德的加减法做得比其他孩子快。
Todd could add and subtract faster than all the other children.
掌握整十数加减法的计算方法。
我还会教他做数学的加减法。
大约有7%的男孩和6%的女孩会加减法。
全是关于加减法的运算。
这或许是个加减法，一切都看你如何看待它。
This may be a plus or a minus, depending on how you look at it.
孩子们在三年级应该有能力去计算加减法。
他正在学习加减法。
做加减法，露西不成问题，可分数却难倒了她。
Lucy knows how to add and substract but fractions have her up a stump.
我女儿在家学习，她五岁，已经学会了加减法。
At 5, my home schooled daughter already knows how to add and subtract.
这个小不点孩子都已经会做简单的加减法问题了。
The little boy can already do simple problems in addition and subtraction.
很危险的是，一些先生甚至连复杂的加减法都不会做。
The danger: students who can not even do simple addition and subtraction.
他能听懂笑话了，学会了怎么去算加减法，还有怎样去阅读。
He discovers knock-knock jokes and learns how to add, subtract, and read.
她想象着仓鼠正在做她的数学试题，用它的小爪子在做加减法……
She pictured the hamster writing her maths exam, using its little claws to add and subtract.
对于加减法运算所需循环的平均数是2，而旧型号机却需12—15。
For adds and subtracts, the average number of cycles required is two, versus about 12 to 15 for the previous type.
二进制加减法，全加器实现及其性能，高速加法，带符号算术运算。
Binary Addition and Subtraction, Implementation and Performance of the Full Adder, High-speed Addition, Signed Arithmetic.
相反，使用 +或 *等符号定义可以执行普通数字加减法的函数。
Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.
同学们对20以内数的加减法掌握较熟，而大部分都不知乘除为何物。
They generally do well in additions and subtractions of numbers short than 20, but few knew what multiplication or division is.
为了提高计算速度，我们今天来学习一些加减法的简便运算。（板书课题）
We're going to learn the tricks of additions and subtractions in this class.
创建一个计算器类，能够在同一时间完成两个数字的加减法。不太懂，原文：%。
Create a class Calculator, which performs the addition and subtraction of two Numbers at a time. The sample code explains the expected API.
如果你的孩子大一些已经学会加减法了，你还可以通过这种方式让他们来学习乘除法。
If you have bigger kids that already know how to add and subtract you could work on division and multiplication problems using the chalk.
某些孩子们似乎特别不擅长数学，即便在学校学过，但某些孩子甚至就连加减法都有问题。
Some kids seem to be particularly poor at math, though, showing difficulty even when routinely adding or subtracting even after extensive schooling.
某些孩子们似乎特别不擅长数学，即便在学校学过，但某些孩子甚至就连加减法都有问题。
Some kids seem to be particularly poor at math, though, showing difficulty even when routinely adding or subtracting even after extensive schooling.
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